Test and Emulate Screens Just Turn Black

[ch_c_]

I'm making a game (it was in capx form), and when i try to test or emulate it, the screen just turns black. I tried it on all the devices, but it just did the same thing. While making my last game, i was able to use the emulate with no problems, but it doesn't work now. Does anyone know how to fix this? Thank you!

[Jihyun_L_]

I have same problem too.

In my case, my game is ok on emulator but that is not OK on mobile device, Just I can see the black screen.

I think It's no problem one month ago. :(